Comparative Nutritional and Antioxidant Compounds of Organic and Conventional Vegetables during the Main Market Availability Period

Seven winter and five summer vegetables produced under organic conventional systems were collected from a supermarket seven times between January April July October for vegetables, respectively, their ascorbic acid total phenolic content (compounds with proven antioxidant activity) as well capacity, soluble solids nitrates determined. The results clearly indicated that, the three factors studied (vegetable species, cropping system sampling time), vegetable species made highest contribution to acid, phenolics, nitrates. Results each showed that most appear have lower nitrate content, some higher capacity solids, only few compared vegetables. significance of differences in nutritional value is questionable, since time can affect great or greater extent than system.